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Hydrostatic traction drive system

a technology of traction drive and displacement volume, which is applied in the direction of mechanical equipment, servomotors, transportation and packaging, etc., can solve the problems of high labor and construction costs, high power loss, and high differential pressure, so as to prevent a decrease in speed and displacement volume of traction motor on the outside of the curv

Active Publication Date: 2018-06-12
LINDE HYDRAULICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables energy-efficient operation with low power losses during curvature by equalizing inlet-side pressures and preventing differential pressures, thus optimizing the hydrostatic traction drive system's efficiency.

Problems solved by technology

Dual circuit systems offer energy-efficient performance when the mobile machine travels around a curve, although on account of the two hydraulic traction pumps the effort and expense of construction are high.
When the mobile machine comprising a bilateral hydrostatic traction drive system having a single-circuit travels around a curve, however, high differential pressures can occur between the two traction motors and as a result high power losses can occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026]The traction drive system 1 of a mobile machine has a first hydraulic traction motor 2a for the drive of a first side of the vehicle, e.g. the left side of the vehicle, and a second hydraulic traction motor 2b for the drive of a second side of the vehicle, e.g. the right side of the vehicle. The traction motors 2a, 2b can each drive a caterpillar track, for example a caterpillar tread or a chain tread.

[0027]The first traction motor 2a and the second traction motor 2b are each operated in an open circuit. A single hydraulic pump 3 is provided to supply the two traction motors 2a, 2b with hydraulic fluid, so that the traction drive system 1 forms a single-circuit system in which a single pump 3 supplies both traction motors 2a, 2b with hydraulic fluid. For the drive system, the pump 3 is in a drive connection, in a manner not illustrated in detail, with a drive motor, such as an internal combustion engine, of the mobile machine.

[0028]Associated with the first traction motor 2a i...

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PUM

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Abstract

A hydrostatic traction drive system of a mobile machine has a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side. The hydraulic traction motors are operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump. The first hydraulic traction motor is controlled by a first control valve and the second hydraulic traction motor is controlled by a second control valve. The first hydraulic traction motor and the second hydraulic traction motor are each variable displacement motors with an electrically variable displacement volume, and the first control valve and the second control valve are electrically actuatable control valves.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority to German Application No. DE 10 2014 117 355.4, filed Nov. 26, 2014, which is herein incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]This invention relates to a hydrostatic traction drive system of a mobile machine with a first hydraulic traction motor associated with a first vehicle side and a second hydraulic traction motor associated with a second vehicle side. The two traction motors are each operated in an open circuit and are jointly supplied with hydraulic fluid by a single hydraulic pump. The first traction motor can be controlled by a first control valve and the section traction motor can be controlled by a second control valve.[0004]Description of Related Art[0005]Hydrostatic traction drive systems on mobile machines in which a hydraulic traction motor is associated with each vehicle side are referred to as bilateral traction drive systems. Bi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H61/4148F16H61/425F16H61/4035F16H61/46F16H61/421F16H61/456F16H61/47F16H61/4008B62D11/00B62D11/06
CPCF16H61/47B62D11/003B62D11/005B62D11/06F16H61/4008F16H61/46F16H61/4148F16H61/421F16H61/425F16H61/456F16H61/4035F15B11/16F15B13/044
Inventor WIERTELLOK, MARKUSKRAFT, WOLFGANG
Owner LINDE HYDRAULICS
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